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1.8mm CS x 56mm ID x 59.6mm OD Buna-N 90 Durometer Metric O-Ring Part number H1.80X056 is a black Buna-N (Nitrile, NBR) 90 durometer metric O-Ring with a 1.80mm cross-section, a 56.00mm inside diameter and a 59.60mm outside diameter. It is made to ISO 3601-1 dimensional tolerances and ISO 3601-3 Grade N surface quality and is sold by The O-Ring Store LLC, an ISO 9001:2015 certified O-Ring distributor. When system pressure climbs, a 70 durometer...